> I have an 8x8 led matrix and I'd like to bounce or move a lighted LED
> around
> in.  Problem is, I'm not sure how to do this in asm.  I'm thinking that I
> need
> to have 8 registers all in sequence and address them directly to map the
> 8x8
> LED matrix to.  Then I can get x,y coordinates?

Just one LED to be lit? Then you only need two output ports, no registers
at all. One port is x, the other is y. The port goint to the cathodes is
inverted(since cathode is negative).

If you need up to all 64 LEDs lit, then you need 8 registes, and also you
will need to scan one of the ports.

Cheerful regards, Bob

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